Oscillating disc pump



Sept. 29, 1959 J. 5. CASE OSCILLATING DISC PUMP Filed Jan. 9, 1958 Q R am mm. n I lmm WWW? ww A w 1.

mm Sv mm Q w w \v w Yuk 8 i A+ n Q Q Y 7 .wkw an mm mm 0 |1|1l mm 9v -l N vw WW7 3m INVENIIIOR John Case BY am ATTORNEY This invention relates generally to pumpingfldevices, and more particularly it pertains to a new design of. a positive displacement oscillating disc pump.

It is to be noted that although this invention is utilized in: connection with fuel pumps, it can be most'r'eadily adapted to pump other kinds of fluids, such as water. or 'other hydraulic media.

It is an object of this invention to provide a new design ofa positive displacement oscillating; disc pump: which can be utilized for pumping fluid of various types.

Still another object of this invention is to provide a :new type of positive displacement oscillating disc pump which can be utilized effectively and efliciently for pumping fuels or hydraulic fluids.-

To provide an improved oscillating disc pump. which :is economical to manufacture, easy; toinstall andv mainrain, and which is efiicient and reliable in operation, are other objects of this invent-ion.

Other objects and attendant advantages of the invention will become obvious as an understanding of the invention is gained through study of the; following detailed description and the accompanying drawings, inwhich:

Fig. 1 is a right end view of a positive displacement oscillating disc pump comprising; this invention;

Fig. 2 is a section of the oscillating disc pump, with some of the parts shown in side elevation, taken along line 2'2: of Fig. l; p

Fig. 3 is a cross section taken along line 3--3 of Fig. 2; and

Fig. 4 is; a section taken at 90 to the view of the oscillating disc pump shown in Fig. 2.

In accordance with the invention, a new and unique design of apositive displacement oscillating. disc pump is provided. This pump consists, in general, of a rotating :shaft. having a semi-circular slot in one end for receiving :a semidisc" having one flat side along a diameter. The :fiat side of the disc contacts a plane surface created by cutting a body, such as a cylinder, at an angle with its longitudinal axis. Both the cylinder with the plane iangular surface and disc are enclosed in a second cylinder. The volume oneither side of the disc is increased or decreased as the shaft and disc are rotated.

Suitable ducts are provided so that the side of the disc undergoing an increase in volume is always connected to a suitable supply of fluid, while the side of the disc undergoing a decrease in volume is always connected to a discharge line.

Referring now to Figs. 1 to 4 of the single sheet of drawings, there is shown the positive displacement oscillating disc pump comprising this invention. This pump 10 consists of a basic housing composed of two end members 12 and 18, and cylindrical shaped intermediate members 14 and 16, all of which are held together by a plurality of bolts 52.

Art opening is provided in end member 18 for receiving a rotating shaft 36 connected to a suitable motor device (not shown) for rotating it at the desired speed. Suitable means can be provided for absorbing the thrust United States Patent 2 resulting from pressure against the" end of. shaft 36.. At the endof the; shaft. opposite the; motor,v aasemicircular shaped slot 38 isprovided; in the. shaft end. for. accommodating a semi-disc 40. This; disc.- 40qis. retained in operative position in the slot;- 38' by means. of a Icylindrical collar 42-.whi'ch pressed on the end of;

shaft 3.6 so that it rotateswith: said shaft whent-he. latter is-turned by the motor; Collar 42; is encompassed bya. bearing sleeve 46, which, in turn, is: positioned adjacent the" intermediate housing member 14.

The end' member 12 also; has; an. openingf20 there; through for receiving anon-rotating, obliquely cut or truncated cylinder 22 having a flat end surface 32i'for contacting the flat side of the disc: 40. Thus, the flat side or diameter side of the disc-40- contacts the plane surface 32- created by cutting the cylinder 22 atanangle with; its longitudinal axis. The truncated end of cylinder 22' is inserted in the. collar 42, as best seen in Figs. 2 and. 4, and is held in position by suitable means. Thus, collar 42. acts as a cylinder for truncated: cylinder The. truncated cylinder 22' is provided with two diametrically opposite ducts 26 and 28, asbest seen in Figs. 2: and 3, running parallel to the longitudinal-axis of the cylinder. These ducts 26 and 2,8. are connected to the volume between the end of shaft. 38. and the truncated. end. of? cylinder 22,- on. one end, and to inlet and outlet ducts 24 and 29, respectively, near the other end of cylinder 22. Inlet duct 24: is connected to a suitable source of fluid supply, such as fueliwhile duct 28 is connected to a discharge line.

An O-ring 30 is provided in a groove in the peripheral surface of cylinder 22 between the collar 42 and the cylinder to prevent leakage of fluid;

A mechanical type o'il seal 4& is. provided between the flanged end of collar 42. and a. diaphragm. positioned between the end member 18 and the intermediate housing member 16. A suital'lle coiled spring is positioned between the wall ofend member 18 and the oil'seal 48 and diaphragm to retain the seal in position.

As best seen in Fig. 4, a relief duct 50 is connected with the supply line 24 and the space. between the truncated end of cylinder 22 and the disc end of shaft 36. An adjustable pressure regulating by-pass relief valve 34 as shown in Fig. 2 is provided between the supply duct 24 and the discharge duct 29. The relief valve- 34 by-passes any excess fluid delivered. to the supply line 24. or otherwise as desired. A duct 44. discharges leakage fluid to bearing 46 and to the inlet duct 24 by means of duct 50.

The operation of the pump 10- will now be described. As the motor (not shown.) rotates shaft 36 and'disc 40 in a clockwise direction as viewed in Fig-.- 3, the longer portion of the truncated cylinder 22 extends alternately into the space enclosed by the endof the cylinder 22, disc 40, and the end of shaft 36- first onone side of the disc 40 and then on the other side thereof.

It the volume on one side of disc 40 is designated as ABD and the volume on the other side as ACD, as shown in Fig. 3, it will be seen that as rotation of the shaft 36 progresses, the volume ABD becomes increasingly smaller while volume ACD becomes increasingly larger. As volume A-BD becomes smaller, the fluid is forced out of the volume ABD through the ducts- 281 and 29. As the volume ACD becomes larger, the fluid is admitted theretothroughthe ducts 2'4 and 26. In the position shown in the figures, the volume ABD equals volume ACD.

When the shaft 36 has rotated 90. from the position shown, the volume ABD has reached a minimum and volume ACD is a maximum. At this point, however, dise40 crosses over the openings of ducts 26 and 28' so that volume ABD is now connected to ducts 24 and 26 and volume ACD is connected to ducts 28 and 29. Since volume ABD is now increasing and volume ABD is decreas- PartehtedSept. 29,1959

ing, flow of the fluid is maintained in the same direction with successive cycles, so as to give a positive displacement, oscillating disc pump arrangement.

Obviously, many modifications and variations of the invention are possible in the light of the above teachings. It should therefore be understood that the invention is limited solely by the scope of the appended claims.

What is claimed is:

1. A pump arrangement, comprising, structure defining a housing having a cylinder therein, means including a cylindrical rotating shaft extending into said cylinder, said shaft having a slot formed in its end located in said cylinder, means including a semi-circular shaped disc positioned in said slot and having a face along the edge diameter of said disc, said disc and slot being positioned in a plane passing through the longitudinal axis of said rotating shaft, a cylindrically shaped element having a truncated end surface extending into said cylinder from the opposite end thereof and spaced from said slotted end of said shaft so that the face of said semi-circular shaped disc continuously engages the truncated end surface of said cylindrically shaped element to form chambers on opposite sides of said disc, a supply line, a discharge line, and means including first and second diametrically opposite ducts located in said cylindrically shaped element and connected to said chambers and said supply and discharge lines, respectively.

2. A pump arrangement, comprising, structure defining a housing having a cylinder therein, means including a rotating shaft extending into said cylinder, said shaft having a slot formed in its end, a semi-circular shaped fiat disc positioned in said slot and having a face along the edge diameter of said disc, said disc and slot being positioned in a plane passing through the longitudinal axis of said shaft, means including a cylindrically shaped element having a truncated end surface extending into said cylinder from the opposite end thereof and spaced from said slotted end of said shaft so that said face of said disc continuously engages the truncated end surface of said cylindrically shaped element to form chambers on opposite sides of said disc, a supply line, a discharge line, and means including first and second diametrically opposite ducts located in said cylindrically shaped element and connected to said chambers and to said supply and discharge lines, respectively.

3. A pump arrangement, comprising, structure defining a housing having a cylinder therein, means including a rotating shaft extending into said cylinder, said shaft having a slot formed in its end, means including a truncated shaped flat disc positioned in said slot and having a fiat face, said disc and slot being located in a plane passing through the longitudinal axis of said shaft, a cylindrically shaped element having a truncated end surface extending into said cylinder from the opposite end thereof and spaced from said slotted end of said shaft so that the flat face of said disc continuously engages the truncated end surface of said cylindrically shaped element to form chambers on opposite sides of said disc, a supply line, a discharge line, means including first and second diametrically opposite ducts located in said cylindrically shaped element and connected to said chambers and said supply and discharge lines, respectively, and pressure regulating means positioned between said supply and discharge lines.

4. A pump arrangement, comprising, structure including a cylinder, a first element extending into said cylinder, a second element extending into said cylinder from the opposite end thereof and spaced therefrom, one of said elements having a slot in its end surface, means including a semi-circular shaped flat disc positioned in said slot and having a fiat face along its edge diameter, said disc and slot being positioned in a plane passing through the longitudinal axis of the one element having the slot therein, the other of said elements being of cylindrical shape and having a truncated end surface continuously engaged by said face of said semi-circular disc to form chambers on either side of said disc, one of said elements being mounted for rotation, a supply line, a discharge line, and means including diametrically opposite ducts located in one of said elements and connected to said chambers and said supply and discharge lines.

5. An arrangement as recited in claim 4, wherein said diametrically opposite ducts are located in said non-rotating element.

6. A pump arrangement, comprising, structure including a cylinder, a first cylindrical element extending into said cylinder, a second cylindrical element extending into said cylinder from the opposite end thereof and spaced therefrom, one of said elements having a slot in its end surface, means including a semi-circular shaped fiat disc positioned in said slot and having a fiat face along its edge diameter, said disc and slot being positioned in a plane passing through the longitudinal axis of the one element having the slot formed therein, the other of said elements having a truncated end surface continuously engaged by said flat face of said semicircular disc to form chambers on either side of said disc, a supply line, a discharge line,

one of said elements being mounted for rotation, and fluid flow means including a pair of ducts, one of said ducts being located in each of said elements, one of said ducts being connected to one of said chambers and to said supply line and the other of said ducts being connected to the other of said chambers and said discharge line.

7. A pump arrangement, comprising, structure including a cylinder, a first cylindrical element extending into said cylinder, a second cylindrical element extending into said cylinder from the opposite end thereof and spaced therefrom, one of said elements having a slot in its end surface, means including a truncated shaped flat disc positioned in said slot and having a flat face, said disc and slot being positioned in a plane passing through the longitudinal axis of the one cylindrical element having the slot formed therein, the other of said elements having a truncated end surface continuously engaged by said fiat face of said disc to form chambers on either side of said disc, one of said elements being mounted for rotatioma supply line, a discharge line and means including first and second diametrically opposite ducts located in the non-rotating element and connected to said chambers and to said supply and discharge lines, respectively.

8. A pump arrangement, comprising, structure includ ing a cylinder, a first cylindrical element extending into said cylinder, a second cylindrical element extending into said cylinder from the opposite end thereof and spaced therefrom, one of said elements having a slot in its end surface, means including a truncated shaped flat disc positioned in said slot and having a fiat face, said disc and slot being positioned in a plane passing through the longitudinal axis of the one cylindrical element that said slot is located in, the other of said elements having a truncated end surface continuously engaged by said fiat face of said disc to form chambers on either side of said disc, one of said elements being mounted for rotation, a supply line, a discharge line, means including first and second diametrically opposite ducts located in the non-rotating element and connected to said chambers and supply and discharge lines, respectively, and pressure regulating means positioned between said supply and discharge lines.

References Cited in the file of this patent UNITED STATES PATENTS 168,034 Lyon Sept. 21, 1875 595,745 Taber Dec. 21, 1897 2,016,605 Kempthorne Oct. 8, 1935 FOREIGN PATENTS 1,868 Great Britain of 1903 

